NCEDC Blog

Category: "Earthquake Catalogue"

The NCEDC is pleased to announce the availability of daily snapshots for the earthquake parameters catalog of the Northern California Seismic System through GitHub. This means that at any time the catalog can be retrieved as it was on a given date. The… more »

Starting 2015/10/07, the Northern California Seismic System (NCSS) is reporting earthquake depths relative to the earth geoid surface (which is approximately mean sea level) instead of the previously used surface of the velocity model used to locate the… more »

What is Geoid depth?
The depth of an earthquake location can be reported relative to the mathematical
geoid surface within the earth, which is very close to sea level. In simplified terms, the geoid is an
imaginary surface within the earth… more »